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Website Speed Optimisation: How Slow Sites Kill Revenue

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Lachlan Nye
Author Lachlan Nye

Director of Growth at Salt Agency, a Brisbane-based performance and creative growth marketing agency. He leads…

Website Speed Optimisation: How Slow Sites Kill Revenue

Let me ask you something. When was the last time you waited more than three seconds for a website to load? You left, didn’t you?

Your customers do the same thing. Every single day.

A slow website isn’t just annoying. It’s costing you money. Real money. I’ve seen businesses in Brisbane lose thousands in potential revenue because their site couldn’t load fast enough. And the worst part? They didn’t even know it was happening.

In this post, I’m going to show you why speed matters, what’s slowing your site down, and exactly how to fix it. Let’s dive in.

The Cost of a Slow Website

Here’s a stat that stopped me in my tracks. Google found that 53% of mobile users abandon a site if it takes longer than three seconds to load. That’s more than half your potential customers gone before they even see your homepage.

Now add this one. A one-second delay in page load time can reduce conversions by 7%. For an online store earning $100,000 a day, that’s a loss of $2.5 million per year. Just from one second.

It’s not just about sales

Slow sites hurt your brand too. People associate speed with professionalism. When your site drags, they assume your business is outdated or unreliable. Ouch.

In a city like Brisbane where competition is fierce, first impressions happen fast. You can’t afford to look slow.

Why Speed Matters More Than Ever

Google made it official. Page speed is a ranking factor for both desktop and mobile searches. And since 2021, Core Web Vitals are part of Google’s algorithm. That’s three specific metrics: Largest Contentful Paint (how fast the main content loads), First Input Delay (how quickly the page responds to clicks), and Cumulative Layout Shift (how stable the layout is).

If your site fails these metrics, you don’t just lose visitors. You lose search rankings. Less organic traffic means fewer leads. Fewer leads means less revenue.

Curious where your site stands right now? I’ll share a free tool in the FAQ section.

What’s Slowing Your Site Down?

Most of the time, the culprit is plain obvious once you know where to look. Here are the usual suspects.

Unoptimised images

This is the number one killer. Someone uploads a 5MB photo straight from their camera. Your server has to send that whole file to every visitor. It takes ages. Compress your images. Use next-gen formats like WebP. It’s that simple.

Heavy plugins and scripts

Every plugin you add comes with extra code. Extra code means more requests and slower load times. If you’re running a bloated CMS with dozens of plugins you don’t use, clean house.

Poor hosting

Cheap shared hosting is like trying to run a race in a crowded hallway. Everyone on the server competes for resources. Upgrade to a decent host or switch to a managed solution.

Too much JavaScript

Fancy animations and interactive elements look great. But if they block the main content from loading, you’ve got a problem. Defer non-critical scripts.

How to Fix It

Here’s the good news. You don’t need to be a developer to make a real difference.

Start by testing your site. Use Google PageSpeed Insights or GTmetrix. They’ll give you a clear report with specific recommendations. Fix the high-priority items first.

Next, compress every image on your site. Tools like TinyPNG or ShortPixel do the job without losing quality.

Enable browser caching. This tells visitors’ browsers to store parts of your site locally. Repeat visits become much faster.

Minify your CSS, JavaScript, and HTML. That means removing extra spaces, commas, and comments from your code. Less code equals faster loading.

Finally, consider a content delivery network (CDN). It serves your site from servers closer to the user. For a business targeting Australian customers, a CDN with local nodes makes a big difference.

And if all this sounds like a headache, that’s where we come in. At Salt Agency, we build fast websites from the ground up. From UI/UX design to development, speed is baked into every project. Want to see how we do it? Check out our blog for more tips, or take a look at how we approach SEO and website performance.

The Bottom Line

Speed isn’t a technical afterthought. It’s a business strategy.

Every second you shave off your load time translates into more conversions, better rankings, and happier customers. In Brisbane’s competitive market, you can’t afford to ignore it.

So here’s my challenge to you. Go test your site right now. See what it says. Then fix the biggest issue, even if it’s just compressing your hero image.

If you want a partner who actually cares about performance, get in touch with us. We’ll build you a website that’s fast, functional, and built to grow your business. No slow sites allowed.

Frequently Asked Questions

How slow is too slow for a website?

Anything over three seconds is too slow. Ideally, aim for under two seconds. Google’s research shows bounce rates climb steeply after the three-second mark.

Does website speed affect SEO?

Absolutely. Google uses page speed as a ranking factor, especially Core Web Vitals. Slow sites rank lower, which means less organic traffic.

How do I test my website speed?

Use Google PageSpeed Insights, GTmetrix, or Pingdom. Each tool gives you a score and a list of specific fixes. Run it on both desktop and mobile.

What’s the easiest quick win for speed?

Compress your images. It takes five minutes using a free tool like TinyPNG and can cut your page weight by 80%. That alone often drops load time by a second or more.

Can a slow website hurt conversions even if people wait?

Yes. Even if visitors eventually see your content, the delay damages their experience. They’re less likely to trust your brand or complete a purchase. Patience is thin online.


References: Google/SOASTA research on page speed and conversions, Google Core Web Vitals documentation, industry data from Akamai and Portent.

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